Carrier MMY-MAP0724FT9UL Service Manual page 143

Check code
Main Outdoor 7-segment display
remote
Check Sub-code
controller
code
F31 F31 —
01:
Compressor 1 side
02:
H01 H01
Compressor 2 side
03:
Compressor 3 side
01:
Compressor 1 side
02:
Compressor 2 side
03:
Compressor 3 side
H02 H02
01:
Compressor 1 side
02:
H03 H03
Compressor 2 side
03:
Compressor 3 side
H05 H05 —
H06 H06 —
*1 Total shutdown in case of header unit
Continued operation in case of follower unit
Location
of
Description
detection
I/F Outdoor
EEPROM error
IPDU Compressor
breakdown
IPDU Compressor
error (lockup)
MG-CTT error
IPDU Current detection
circuit error
I/F TD1 sensor
miswiring
(incomplete
insertion)
I/F Activation of
low-pressure
protection
Error detection
System status
condition(s)
All stop *1 Outdoor P.C. board
(I/F) does not
operate normally.
All stop Inverter current
detection circuit
detects overcurrent
and shuts system
down.
All stop Overcurrent is
detected several
seconds after startup
of inverter
compressor.
All stop Current flow of at
least specified
magnitude is
detected despite
inverter compressor
having been shut
turned off.
All stop Discharge
temperature of
compressor 1 (TD1)
does not increase
despite compressor
being in operation.
All stop Low-pressure Ps
sensor detects
operating pressure
lower than 0.02MPa.
– 143 –
Check items (locations)
• Check power supply voltage.
• Check power supply noise.
• Check for defect in outdoor P.C. board
(I/F).
• Check power supply voltage.
(FT9 : 208/230V ± 10%, FT6 : 460V ± 10%).
• Check for defect in compressor.
• Check for possible cause of abnormal
overloading.
• Check for defect in outdoor P.C. board
(A3-IPDU).
• Check for defect in compressor.
• Check power supply voltage.
(FT9 : 208/230V ± 10%, FT6 : 460V ± 10%).
• Check compressor system wiring,
particularly for open phase.
• Check connection of connectors/
terminals on A3-IPDU P.C. board.
• Check conductivity of case heater.
(Check for refrigerant entrapment inside
compressor.)
• Check for defect in outdoor P.C. board
(A3-IPDU).
• Check outdoor MG-CTT.
• Check current detection circuit wiring.
• Check defect in outdoor P.C. board
(A3-IPDU).
• Check installation of TD1, TK1, TK2,
TK3, TK4, TK5 sensor.
• Check connection of TD1, TK1, TK2,
TK3, TK4, TK5 sensor connector and
wiring.
• Check resistance characteristics of TD1
sensor.
• Check for defect in outdoor P.C. board
(I/F).
• Check service valves to confirm full
opening (both discharge gas side, suction
gas side and liquid sides).
• Check outdoor PMVs for clogging
(PMV1, 2).
• Check for defect in SV2 or SV4 circuits.
• Check for defect in lowpressure
Ps sensor.
• Check indoor filter for clogging.
• Check valve opening status of indoor PMV.
• Check refrigerant piping for clogging.
• Check operation of outdoor fan (during In
all heating, collective operation).
• Check for insufficiency in refrigerant
quantity.
• Check clogging in circuit at sub heat
exchanger liquid side .
(PMV4, Checked valve)
• Check 4-way valve error (Reversal error)
• Check miswiring of discharge/suction gas
main piping.
• Check Cool/Heat FS unit.
• Check mispiping of discharge/suction gas
piping to Cool/Heat FS unit.
• Check piping between Cool/Heat FS unit
and room.
• Check miswiring of SVD/SVS valve, and
mis mounting of coil.
• Check opened status of SVS valve.
• Check SV14 circuit error
MG-CTT: Magnet contactor